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73 lines
2.1 KiB
Scheme
73 lines
2.1 KiB
Scheme
;;; Read-Eval-Print Loop
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;; Copyright (C) 2001 Free Software Foundation, Inc.
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;; This program is free software; you can redistribute it and/or modify
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;; it under the terms of the GNU General Public License as published by
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;; the Free Software Foundation; either version 2, or (at your option)
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;; any later version.
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;;
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;; This program is distributed in the hope that it will be useful,
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;; but WITHOUT ANY WARRANTY; without even the implied warranty of
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;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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;; GNU General Public License for more details.
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;;
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;; You should have received a copy of the GNU General Public License
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;; along with this program; see the file COPYING. If not, write to
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;; the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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;; Boston, MA 02111-1307, USA.
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;;; Code:
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(define-module (system repl repl)
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:use-syntax (system base syntax)
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:use-module (system repl common)
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:use-module (system repl command)
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:use-module (system vm frame)
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:use-module (ice-9 rdelim)
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:export (start-repl))
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(define (start-repl lang)
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(let ((repl (make-repl lang)))
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;; (set-current-vmodule! repl.module)
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;; (set-current-evaluator! repl.vm)
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(repl-welcome repl)
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(let prompt-loop ()
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(repl-prompt repl)
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(call-with-error-handlers
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(lambda ()
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(if (eq? (next-char #t) #\,)
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;; meta command
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(begin (read-char)
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(meta-command repl (read-line)))
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;; evaluation
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(let rep-loop ()
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(repl-print repl (repl-eval repl (repl-read repl)))
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(if (next-char #f) (rep-loop))))))
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(prompt-loop))))
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(define (next-char wait)
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(if (or wait (char-ready?))
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(let ((ch (peek-char)))
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(cond ((eof-object? ch) (throw 'quit))
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((char-whitespace? ch) (read-char) (next-char wait))
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(else ch)))
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#f))
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;;;
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;;; Error handler
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;;;
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(define (call-with-error-handlers thunk)
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(catch 'vm-error
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(lambda () (catch 'user-error thunk error-handler))
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error-handler))
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(define (error-handler key . args)
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;; (case key
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;; ((vm-error)
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;; (write (frame->call (cadddr args)))
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;; (newline)))
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(display "ERROR: ")
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(apply format #t (cadr args) (caddr args))
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(newline))
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